CN218798853U

CN218798853U - Combined core mould for forging large crank inner cavity

Info

Publication number: CN218798853U
Application number: CN202223227154.3U
Authority: CN
Inventors: 张晖; 张连华; 陈习中
Original assignee: Jiangsu Huawei Machinery Manufacturing Co ltd; Zhongjuxin Ocean Engineering Equipment Co ltd
Current assignee: Jiangsu Huawei Machinery Manufacturing Co ltd; Zhongjuxin Ocean Engineering Equipment Co ltd
Priority date: 2022-12-03
Filing date: 2022-12-03
Publication date: 2023-04-07
Anticipated expiration: 2032-12-03

Abstract

The utility model relates to a forge combination mandrel of large-scale crank inner chamber. The die comprises a die body and a die handle, wherein the die handle and the die body are in a shovel shape, the front part of the die body is provided with a shovel head, the rear part of the die body is provided with a shovel tail, the thickness of the shovel tail is larger than that of the shovel head, two or more core dies with the thickness larger than that of the shovel head are arranged, the difference between the thickness of the shovel tail and that of the shovel head of each core die is different, the step forging is carried out on the crank cavity, the core dies are continuously replaced according to the sequence from large to small in the thickness difference of the die bodies, the crank cavity is gradually forged, the die cavities are further repeatedly forged by the core dies with different thicknesses without the thickness difference, the die cavities inside the cranks are closer to the design requirements, and the minimum metal processing allowance of the forged piece can be realized. Because the core die is replaced frequently, the temperature of the core die is not too high, die sticking is avoided, the forging is well formed, and the service life of the die is long.

Description

Combined core mould for forging large crank inner cavity

Technical Field

The utility model relates to a forge mould, concretely relates to large-scale crank inner chamber forges fashioned combination mandrel belongs to and forges technical field.

Background

The crank shaft is a key part for external transmission of mechanical energy of an engine, the crank throw is an important part for converting reciprocating motion into rotary motion, the crank throw of the large-scale crank shaft is large and complex in stress, and therefore the crank throw has enough rigidity, strength and capacity of bearing impact load, and in order to meet the performance requirements, a forged crank throw is usually selected. The process of forging the crank throw is very complicated, and the currently known advanced process is forging twice, wherein the first heat is as follows: drawing, upsetting, drawing to a preliminarily set size, upsetting to a proper size, further drawing to a set size, and forging a boss and double wings through multiple processes; the second fire time: pressing the double wings to thin, drawing out and finishing to set size, forging the semi-cylindrical bent neck, bending the double wings around the bent neck, and finally pressing the double wings and finally forging. In the process, upsetting, drawing, rounding and bending are provided with the special anvil, and during the double-fin pressing and final forging forming process, because the shape of the die and the design of the forging process are unscientific, the double-fin pressing is often not in place, and the die sticking can be caused by high-temperature heat conduction, so that the pressing die and the forging are damaged.

Disclosure of Invention

The utility model provides a forge combination mandrel of large-scale crank inner chamber, in the crank finish forging technology, set up a set of fashioned mandrel that is used for the inner chamber, realize the fashioned purpose of forging progressive.

The utility model provides a forge combination mandrel of large-scale crank inner chamber, every mandrel includes die body and die shank, die body and die shank disjunctor, die shank and die body one-piece shovel shape, the die body front portion is shovel head, and the rear portion is shovel tail, its characterized in that:

the thickness of the shovel tail is larger than that of the shovel head, and the section from the shovel head to the shovel tail is isosceles trapezoid;

the core moulds with the thickness of the shovel tail larger than that of the shovel head are arranged into two or more than two, and the included angle between the isosceles trapezoid waist and the isosceles trapezoid bottom on each core mould is different;

the thickness of the shovel head is the same as that of the shovel tail, and the cross section from the shovel head to the shovel tail is rectangular;

the core moulds with the same thickness of the shovel head and the shovel tail are arranged into 1-3, and the width of the rectangle on each core mould is different.

Preferably, the front end of the shovel head is provided with an inward concave arc, and the curvature of the arc is the same as that of a crank neck forging of the crank throw.

Further, the left width and the right width of the die body are the same as the technological dimension of the forge piece.

The utility model discloses in, the mandrel step that will forge crank throw die cavity sets up, set up a set of die body, its front end thickness is less than the thickness of rear end, and the thickness difference of every mandrel, constantly change the mandrel according to the order of thickness difference from big to little, forge the crank throw die cavity gradually, make the progressive shaping of die cavity, further forge the die cavity repeatedly with the mandrel of the different thickness that does not have thickness difference at last, make the inside die cavity of crank throw more be close to the designing requirement, and can realize that the gold finishing surplus of forging is minimum. The utility model discloses have: the die is not stuck, the forging is well formed, the service life of the die is long, and the like.

Drawings

FIG. 1 is a schematic view of the structure of the present invention,

figures 2 and 3 are cross-sectional views of the mold body with a thickness of the rear portion greater than the thickness of the front portion,

FIG. 4 is a cross-sectional view of the same thickness of the front and rear portions of the mold body,

figure 5 is a schematic view showing a forging state of the core mold in which the difference between the rear portion thickness and the front portion thickness of the mold body is the largest,

FIG. 6 is a schematic view showing a forging state of a core mold in which a difference between a rear thickness and a front thickness of a mold body is small,

fig. 7 is a schematic view showing a forging state of a core mold in which the front and rear portions of the mold body have the same thickness.

In the attached drawing, 1 is a die body, 2 is a die handle, 3 is an upper anvil, 4 and 7 are manipulators, 5 is a lower anvil, and 6 is a crank forging.

Detailed Description

The invention is further explained below with reference to the drawings:

fig. 1, 2, 3 and 4 show a combined core mold, which is composed of two core molds 1 with different thicknesses and a core mold 1 with the same thickness, wherein fig. 1 shows that the core mold is in a shovel shape composed of a mold handle 2 and the mold body 1, the shovel head part of the core mold is provided with an inward concave arc, and the mold body 1 is in a flat plate shape. Fig. 3 shows a section of the core mold in which the thickness of the mold body 1 at the shovel tail is greater than that of the shovel head, and the difference between the thicknesses of the shovel tail and the shovel head is smaller than that of the core mold shown in fig. 2, and fig. 4 shows a section of the core mold in which the thickness of the shovel tail of the mold body 1 is the same as that of the shovel head.

Fig. 5 shows a state that the core mold with the largest difference between the thickness of the shovel tail and the thickness of the shovel head forges two wings of the crank, the manipulator 4 clamps the crank forging 6 and stands between the upper anvil 3 and the lower anvil 5, the manipulator 7 clamps the core mold with the largest difference between the thickness of the shovel tail and the thickness of the shovel head and inserts the core mold into an inner cavity of the crank forging 6, a concave arc at the shovel head part faces to a crank neck inside the crank forging, and the upper anvil 3 and the lower anvil 5 extrude the crank forging 6 to enable the two wings to approach to the mold body 1.

Fig. 6 shows a state that the difference between the thickness of the shovel tail and the thickness of the shovel head is small, the core die forges the two wings of the crank, and the double wings of the crank forging 6 are further close to the die body 1 in the same way as fig. 4.

Fig. 7 shows a state that a core mold with the thickness of the shovel tail being the same as that of the shovel head forges two wings of a crank, a manipulator 4 clamps a crank forging 6 and stands between an upper anvil 3 and a lower anvil 5, the manipulator 7 clamps the core mold with the thickness of the shovel tail being the same as that of the shovel head and inserts the core mold into an inner cavity of the crank forging 6, a concave arc at the shovel head part faces a crank neck inside the crank forging, the upper anvil 3 and the lower anvil 5 extrude the crank forging 6 and synchronously rotate the crank forging 6 and the core mold, and a cavity inside the crank forging 6 and an outer side face are subjected to final forging.

Claims

1. The utility model provides a forge combination mandrel of large-scale crank inner chamber, every mandrel includes die body and die shank, die body and die shank disjunctor, die shank and die body one-piece shovel shape, the die body front portion is shovel head, and the rear portion is shovel tail, its characterized in that:

the thickness of the shovel tail is larger than that of the shovel head, and the section from the shovel head to the shovel tail is an isosceles trapezoid;

2. The combined core die for forging the large-scale crank inner cavity according to claim 1, wherein: the front end of the shovel head is provided with an inward concave arc, and the curvature of the arc is the same as that of the crank neck forging of the crank.

3. The combined core mould for forging the inner cavity of the large bell crank as claimed in claim 1, wherein: the left width and the right width of the die body are the same as the technological dimension of the forge piece.